Adjusts the alignment of the watermark image within the base image when the mark parameter is specified.

Possible values are left, center, or right for the horizontal positioning of the the text, and top, middle, or bottom for the vertical positioning. Values can be combined by separating them with commas. The default is bottom,right.

• Default: Position to the bottom right of the base image.
• top: Align to the top of the base image.
• middle: Align to the vertical middle of the base image.
• bottom: Align to the bottom of the base image.
• left: Align to the left side of the base image.
• center: Align to the horizontal center of the base image.
• right: Align to the right side of the base image.